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A Predistortion Linearizer with Tunable Amplitude and Phase

A linearizer and pre-distortion technology, applied in the direction of improving the amplifier to reduce nonlinear distortion, etc., to achieve the effect of simple and compact structure, easy processing, and novel structure

Inactive Publication Date: 2017-02-15
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose an amplitude-phase tunable pre-distortion linearizer for the problems existing in the above-mentioned traditional pre-distortion linearizer

Method used

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  • A Predistortion Linearizer with Tunable Amplitude and Phase
  • A Predistortion Linearizer with Tunable Amplitude and Phase
  • A Predistortion Linearizer with Tunable Amplitude and Phase

Examples

Experimental program
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Effect test

Embodiment 1

[0029] When Freq=8.15GHz, R2=700Ω, V2=2V, V1=0V~14V, it can be obtained as figure 2 The amplitude predistortion curve shown and as image 3 The phase predistortion curve shown. It can be seen from the figure that at the frequency of 8.15GHz, when the input power is in the range of -30dBm~﹢20dBm, the magnitude of the transmission coefficient of the predistorter increases nonlinearly, and the increase range is 5dB~10.5dB; the phase of the transmission coefficient of the predistorter is Non-linear change, the change range is -30°~+40°. This example shows that when two parallel transmission analog predistortion circuits are in a certain bias state, as the input power increases, the bias voltage of the phase shifter is adjusted V1 = 0V ~ 4V, the amplitude of the transmission coefficient increases nonlinearly, and the phase appears Non-linear compression, contrary to the non-linear characteristics of solid-state power amplifiers, can meet the pre-distortion requirements of microw...

Embodiment 2

[0031] When Freq=8.15GHz, V1=0V, R2=700Ω, V2=1V~3.5V, it can be obtained as Figure 4 The amplitude predistortion curve shown and as Figure 5 The phase predistortion curve shown. It can be seen from the figure that at the frequency of 8.15GHz, when the input power ranges from -30dBm to +20dBm, the magnitude of the transmission coefficient of the predistorter increases nonlinearly, and the increase range is 6dB to 16dB; the phase of the transmission coefficient of the predistorter is non-linear. Linear compression, the change range is -12°~-35°. This example shows that when the phase shifter is in a certain bias state, with the increase of input power, the bias state of two parallel transmission analog predistortion circuits is adjusted, the transmission coefficient amplitude shows a nonlinear increase, and the phase shows a nonlinear compression. Contrary to the nonlinear characteristics of the solid-state power amplifier type, it can meet the pre-distortion requirements of...

Embodiment 3

[0033] When Freq=8.15GHz, V1=14V, R2=700Ω, V2=1V~3.5V, can get as follows Image 6 The amplitude predistortion curve shown and as Figure 7The phase predistortion curve shown. It can be seen from the figure that at the frequency of 8.15GHz, the amplitude of the transmission coefficient of the predistorter increases non-linearly within the range of -30dBm~﹢20dBm when the input power is in the range of 1dB~10dB; the phase of the transmission coefficient of the predistorter is non-linear. Linear compression, the change range is 35°~55°. This example shows that when the phase shifter is in a certain bias state, with the increase of input power, the bias state of two parallel transmission analog predistortion circuits is adjusted, the amplitude of the transmission coefficient increases nonlinearly, and the phase increases nonlinearly. Contrary to the nonlinear characteristics of the traveling wave tube amplifier type, it can meet the predistortion requirements of the microwave tr...

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Abstract

The invention belongs to the technical field of microwave linearization, in particular to an amplitude and phase tunable predistortion linearizer. Based on the working mechanism of diode pre-distortion linearization, the pre-distortion linearizer of the present invention utilizes the principle of vector superposition to obtain pre-distortion nonlinear compensation of different amplitude and phase requirements through phase changes, which overcomes the traditional series and parallel transmission The analog predistortion circuit can only generate predistortion signals suitable for solid-state power amplifiers, and most reflective predistortion circuits can only generate predistortion signals suitable for microwave traveling wave tube power amplifiers. At the same time, the linearizer improves microwave The ability of the pre-distortion circuit to control the degree of amplitude expansion and phase expansion of the generated nonlinear signal can achieve accurate strong nonlinear amplitude and phase compensation.

Description

technical field [0001] The invention belongs to the technical field of microwave linearization, in particular to an amplitude and phase tunable predistortion linearizer. Background technique [0002] The development direction of modern wireless communication systems is multi-user, high-capacity, high-quality communication with higher signal transmission rates, which makes microwave communication systems with wider operating frequency bands and higher information capacity attract more and more attention. The current microwave communication system mostly adopts broadband, multi-carrier, and complex digital modulation technology. This kind of modulation method puts forward extremely high requirements on the linearity of the channel, and the microwave power amplifier of the transmitter is the main factor affecting the linearity of the channel. In a microwave communication system, in order to achieve low system cost and high efficiency, and to maximize the performance of the fina...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/32
Inventor 谢小强李大伟周强延波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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